RPC Plugin System

[yusufhm]

Created a quick sandbox for creating external plugins using Hashicorp's go-plugin.

You can get the sample working by running:

go build -o build/shipshape
go build -o build/plugin-sample examples/plugin/sample.go
./build/shipshape plugin

Output similar to the following should be generated:

2024-10-21T12:45:35.988+0400 [DEBUG] plugin: starting plugin: path=./build/plugin-sample args=[./build/plugin-sample]
2024-10-21T12:45:35.990+0400 [DEBUG] plugin: plugin started: path=./build/plugin-sample pid=79104
2024-10-21T12:45:35.990+0400 [DEBUG] plugin: waiting for RPC address: plugin=./build/plugin-sample
2024-10-21T12:45:35.996+0400 [DEBUG] plugin.plugin-sample: message from plugin: foo=bar timestamp=2024-10-21T12:45:35.995+0400
2024-10-21T12:45:35.996+0400 [DEBUG] plugin: using plugin: version=1
2024-10-21T12:45:35.996+0400 [DEBUG] plugin.plugin-sample: plugin address: address=/var/folders/lq/gql2jg193ndbp64b2z32qp8r0000gn/T/plugin366665257 network=unix timestamp=2024-10-21T12:45:35.996+0400
2024-10-21T12:45:35.997+0400 [DEBUG] plugin.plugin-sample: message from SampleOutput.Output: timestamp=2024-10-21T12:45:35.997+0400
output from plugin: ResultList: {map[policy1:[rule1 rule2]] false 0 0 map[] map[] map[] map[] [{result1   [rule1] [] []  }]}

2024-10-21T12:45:35.997+0400 [DEBUG] plugin.plugin-sample: 2024/10/21 12:45:35 [DEBUG] plugin: plugin server: accept unix /var/folders/lq/gql2jg193ndbp64b2z32qp8r0000gn/T/plugin366665257: use of closed network connection
2024-10-21T12:45:35.997+0400 [INFO]  plugin: plugin process exited: plugin=./build/plugin-sample id=79104
2024-10-21T12:45:35.998+0400 [DEBUG] plugin: plugin exited

The line saying output from plugin: ResultList:... is the indication that the plugin works.